Electric bell.



S. G. BRYANT.

ELECTRIC BELL.

APPLICATION FILED AUG. 27, 1913.

Patented Dea 15, 1914 7H5 NORRIS PETERS 6a., PHOTO-LITHG.. WASHINGTON. O. r.

3 ANT @FFTC.

STANLEY CHARLES BRYANT, OF CHICAGO, ILLINOIS, ASSIGNOR TO BRYANT ZINC COMPANY, A CORPCRATION OF ILLINOIS.

ELECTRIC BELL.

Specification of Letters Patent.

Patented Dec. 15, 19141:.

Application filed August 27, 1913. Serial No. 786,861.

To all whom 1'25 may concern:

Be it known that I, STANLEY CHARLES BRYANT, a citizen of the United States, and a resident of the city of Chicago, in the county of Cook and State of Illinois, have invented a new and useful Electric Bell, of which the following is a specification.

This invention relates to an electric bell.

The primary object of this invention is the construction of an electric bell such that the bell may be capable of being operated for long periods of time without any attention whatever being given to it. 1

Another object of the invention is to so construct a device of the kind specified that it will be so strong and rugged in all of its parts that it may be employed for the pur pose of a highway crossing bell to warn pedestrians and drivers of vehicles approaching a railroad crossing at grade, that a train is about to cross the highway.

Another object of the invention is a construction such that the usual non-magnetic pins will not be necessary in the ends of the cores of the electro-magnet forming a part of the device, consequently, all liability of the armature, constituting part of the device, sticking to the poles by the battering down of the pins, will be obviated.

Another object of the invention is to so construct a bell of the kind designated, that gravity alone will be used to return the movable parts to the initial position after being moved therefrom.

Other objects and advantages will appear as the description of the invention progresses, and the novel features of the invention will be particularly pointed out in the appended claims.

In describing the invention in detail, reference is had to the accompanying drawing, wherein I have illustrated a preferred physical embodiment of my invention. and wherein like characters of reference designate corresponding parts throughout the several views, and in which- Figure 1 is a front elevational view of my improved hell with certain parts in section; Fig. 2, is a side elevational View of my improved construction with the gong of the bell in section; Fig. 3, is a top plan view of my improved construction with the gong in section.

1, designates a gong to which a hanger 2 is attached, best shown in Fig. 2, by means of the bolt 3 and nut at. This hanger supports and has rigidly attached'thereto one end of an elbow piece 5, the other end of which is rigidly attached to and supports the carrying plate 6. At the point where the hanger 2 and the elbow piece 5 overlap, cores 7 and S are attached to and supported by the elbow plate, which is made of a magnetic material so as to form a yoke uniting the lower ends of the cores. The cores 7 and 8 have placed thereon the form-wound coils 9 and 10 of insulating wire formed in the usual manner and also connected as is usual in electro-magnets by the wire 11, their remaining terminals being connected to thewires 12 and 13.

The carrying plate 6 has rigidly attached thereto and supports a mounting plate 14. This mounting plate at its lower end is bifurcated, best shown in Fig. 1, and has formed therein a bearing for supporting the shaft 15, also well shown in Fig. 2. The shaft 15 forms apivot for armature 16, which has a rearward extension formed into a bearing for the purpose of allowing the shaft 15 to pass therethrough. Near the top of the mounting plate, an outstanding arm 17 is formed which has a reduced outer end as at 18, upon which is mounted a three-armed member 19. One arm 20 of member 19 extends to the right as viewed in Fig. 1, and is adapted to contact with the stop 21 formed on the mounting plate; another arm 22, extends to the left as viewed in Fig. 1, and is adapted to. contact with the stop 23 formed on the mounting plate 1 1; the third arm 24: extends downwardly and to the right as viewed in Fig. 1, and has rigidly fastened thereto a resilient arm 25, which bears at its outer end the hammer 26, which is adapted upon being properly moved, to strike the gong 1. The arm 22 of the member 19 has a pin 27 rigidly mounted therein, which. engages the upper end of a link 28, the lower end of which engages a pin 29. passing through two spaced vertical lugs 30 and 31 formed integral with the armature 16. The link 28 has rigidly fastened thereto a block of insulating material 32 which carries a strip of metallic conducting material 33, which has both its upper and lower ends bent outwardly as best shown in Fig. 1, so as to be adapted to contact with the springs 34 and 35 upon an up and down movement of the link 28. The

mounting plate 14 also supports the binding post 42 insulated as shown and which is electrically connected by the flexible ribbon 43 with the member 33.

The carrying plate 6 has rigidly attached thereto the insulating block 36, as best shown in Fig. 3,which bears binding post 37 and combined binding post and contact spring supports 38 and 39. The spring contact supports 38, and 39 each support the spring contacts34 and 35., both of which as best shown by Fig. 1, are supported by being rigidly attached to the underside of the posts 40 and 41 formed integral with the members 38 and 39 respectively. It should also be noted that the spring contacts Y34 and 35, although fastened to the underside of the members 40 and 41,.are also formed of a curved shape,

' so as to pass up over the members 40 and 41,

. so cause the armature 16 to be drawn clownwardly, which acting through the link 28 will cause the three-armed lever 19 to be oscillated so that hammer 26, strikes the gong 1. The extent of movement of the hammer 26 is governed by the distance through which the arm 22 will travel before contacting with stop 23 and the distance through which the armature 16 will travel, is also governed by the movement of the same arm. The distance through which arm 22 will move is so adjusted by positioning the stop 23 that armature 16 cannot come in contact with the ends of the cores 7 and 8, therefore, no pins varevneeded the ends of cores 7 and .8 as there can be .no lia- :bility of the armature sticking to the ends of the cores 7 and .8 as it never comes in contact therewith. As the extent of ,movement of the hammer 26 is controlled the extent of movement of the arm .22 and as arm 22 and stop .23.are both made large and substantial and little subject to wear, and as arm .24 is large and substantial .and 25 is made of a resilient material which will maintain its resiliency, the blowflstruck by the hammer 26 upon the gongl will always be, withxa given strength of battery-45, Substantially the same. The movement .of the link. 28 downwardly separates contact spring 34rand member-.33 so that circuit through the .electrormagnet is broken. As soon as the circuit through the .e lectro:magnet isibroken 5 by the separation of the member 33 and the together with link 28 and armature-16 return to their initial position as shown in Fig. 1, being moved thereto by the weight of the hammer 26 acting through the three armed lever 19. The accurate return of the parts to the exact predetermined initial position is governed by the contacting of arm 20 with stop 21', both of which parts are made strong and substantial so as to obviate the liability of change of any'adjustment and to prevent any undue wear. The return of the parts to the initial position, as is obvious, again allows current to flow through the electro-magnet and the hammer 26 is again caused to strike the gong, and this action as described, continues until the switch 44 is opened. 1

The novel method of mounting spring contact 34 is for the purpose of insuring that contact will always be broken between members 33 and 34 upon a downward movement of the armature 16. The fact upon which this construction is based, is that a piece of resilient material bent into a curve, tends to straighten out rather than to become more curved, that is, the free end of spring 34 by use tends to assume a position higher than that in which it is shown in Fig. 1, but if it were bent downwardly from member 41, it would tend to assume a position lower than that in which it was first placed, so that by use it mightremain in contact with member 33 even after armature 16 had moved to its lowest position, so that the bell would simplya'ct as a single stroke bell. By the construction adopted, should the spring 34 change its position with relation to 33, such change will be upward and the change will be very gradual so that should this change occur, the bell will continue to ring, although the loudness of the sound will be diminished due to the shorter impulse acting on the ham-. mer. This change in ringing would give amaintainer notice that the adjustment had moved and therefore required attention. The farther up the spring 34 bends the less will be the movement given it by member 33., and the less movement given spring 34 by member 33, ,so much will be the bending of spring 34 lessened,- thus there is a point where these two movements will equalize, with the result that .shouldspring 34 lose its tension, it will stillremainv in a. position to make contact withthe member 33 and allow contact spring 34, the three-armed lever 19 I the bell to ring. Spring 35 is adapted to 1 contact the underside of the upper "bent-over end-of member33. There is, then, of course,

a chance that spring contact 35 may remain permanently in contact with the end of member 33, and so failing to act as a circuit controller, but by reason of th very fact Although I have particularly described the construction of one physical embodiment of my invention, and explained the operation and principle thereof; nevertheless, I desire to have it understood that the form selected is merely illustrative, but does not exhaust the possible physical embodiment of the idea of means underlying my invention.

What I claim as new and desire to secure by Letters Patent of the United States, is:

1. In an electric bell, in combination: an oscillatable armature having an upper and a lower position; a metallic contacting member oscillatable with the armature; a fixed post; a conducting member of resilient material attached to the underside of said post and then bent up and over said post and extending away from said post into the path of movement of said metallic contacting member so as to contact therewith when the armature is in its upper position, the set of the member being such that it breaks contact with the metallic member before the armature reaches the lower position.

2. In an electric bell, in combination: an electro-magnet; an armature for the electro-magnet; a pivot for one end of the armature; a link connected to the unpivoted end of the armature; a pivoted three armed lever having one arm connected to the link; a rigid stop for limiting the movement of the said one arm in one direction; another rigid stop for limiting the movement of another of said arms in the opposite direction; a spring arm connected to the third of said arms; a hammer attached to said spring arm; a gong for said hammer; a source of current; a binding post; a connection from said source to said binding post; an insulated metallic strip carried by said link; a flexible conducting ribbon between said metallic strip and said binding post; a spring post, a spring which normally bears against said metallic strip supported by said post; a conductor connecting said post with one terminal of the electro-magnet; a connec tion between the other terminal of the elec-., tro-magnet and the source of current.

STANLEY CHARLES BRYANT.

Witnesses T. WV. PREMERIUS, A. F. KLINK.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patentsf Washington, D. Q. 

